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It was one of the worlds guarded by the Four Goddesses.
Four goddesses who fought for the supremacy of the world, later called the Guardian Goddess War, but the lower world where the people lived was full of monsters due to the conspiracy of Magé Connu.
During such a struggle, one of the goddesses, Neptunnu, was defeated by the other goddesses and fell from heaven to the lower world and lost his memory.
Neptunnu was led by Compat and Ayev, whom he met in the lower world, and by the mysterious voice of the history book Isthwar, to embark on an adventure journey through the four continents of the lower world.